Outage Analysis of Non-Orthogonal Multiple Access-Based Integrated Satellite-Terrestrial Relay Networks With Hardware Impairments

Xiaogang Tang,Sun'An Wang,Kang An,Kefeng Guo,Yuzhen Huang

doi:10.1109/access.2019.2944406

Abstract

In this article, we investigate the impact of hardware impairments (HIs) on the performance of non-orthogonal multiple access (NOMA) based integrated satellite-terrestrial relay networks (ISTRNs). Particularly, we obtain the novel closed-form expression for the outage probability (OP) of the considered NOMA-based ISTRNs with HIs. Furthermore, to get further insights of the effect of HIs on the considered system in high signal-to-noise ratios (SNRs) scenario, the asymptotic expression for the OP is also obtained, which provides an efficient way to evaluate the system performance, and effective quantification of different parameters on the system performance. Furthermore, we study the energy efficiency (EE) of the considered system and obtain interesting findings when NOMA scheme is applied. At last, numerical Monte Carlo (MC) results are given to verify the correctness of the theoretical results.

Highlights

Satellite communication (SatCom) has become a promising approach due to the growing demand for higher quality, greater capability and wider coverage of wireless services [1]
In this paper, we investigated the effects of hardware impairments (HIs) on the performance of non-orthogonal multiple access (NOMA)-based integrated satellite-terrestrial relay networks (ISTRNs)
In order to obtain deep insights, we provided the asymptotic expression for outage probability (OP) in high signal-to-noise ratios (SNRs) regime

Summary

INTRODUCTION

Satellite communication (SatCom) has become a promising approach due to the growing demand for higher quality, greater capability and wider coverage of wireless services [1]. In [35], the effect of HIs was analyzed for the SatCom systems, the exact and asymptotic expressions for the OP of the considered network with independent non-identical distribution (i.n.i.d) and HIs were derived. We derive the closed-form expressions for the OP and EE the NOMA-based ISTRN, which give valuable ways to evaluate the effects of the important parameters on the performance for the system. We obtain the asymptotic expression for OP of the considered NOMA-based ISTRN, which provides an effective approach to quantify the system performance at high SNRs. The remaining of this paper is shown as follows. Notations: Bold uppercase letters present matrices and bold lowercase letters present vectors, |·| denotes the absolute value of a complex scalar; exp (·) is the exponential function, E [·] is the expectation operator, CN (a, b) denotes the complex Gaussian distribution of a random vector a and covariance matrix b

SYSTEM ILLUSTRATION AND PROBLEM FORMULATION

THE CHANNEL MODEL

ASYMPTOTIC OP

ENERGY EFFICIENCY

NUMERICAL RESULTS

CONCLUSION